Attributes . High Carbon Steel (C with a content over 0.45%) / Quenched and tempered steel (25 to 35 HRC) / Quenched and tempered steel (35 to 45 HRC) / Tool Steel (Before SKD Hardening) / Steel casting (SC) / Cast Iron (FC) / Ductile Cast Iron (FCD) / Titanium Alloy (Ti-6Al-4V, etc) / Nickel-based alloy (Inconel, etc.) . Names